这个对二萜类化学成分 quassinoid diterpenoids ; qubumminoid diterpenoids
采用水蒸气蒸馏法从杜梨花中提取挥发油，用气相色谱-质谱法对化学成分进行鉴定。
The essential oil from the flowers of Pyrus betulaefolia Bunge was abstracted by steam-stilling and analyzed by capillary GC-MS method.
本文对断轴进行了宏观断口检查并对化学成分、力学性能、高低倍组织及微观断口进行了分析。
In this paper, the fracture surface of a failed axle was examined macroscopically. The chemical composition, mechanical properties, ma-cro-and microstructure of the fracture surface were analysed.
采用水蒸气蒸馏法从巴旦木杏仁中提取挥性化学成分，用气相色谱-质谱法对化学成分进行鉴定。
The volatile chemical components extracted from the almond of Prunus amygdalus Stokes was abstracted by steam-stilling and analyzed by GC-MS method.
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